Donald Trump won a major victory yesterday in his battle against the Beekman neighbors of his Trump World Tower.

In a 35-page decision, a four-judge Appellate Division panel unanimously agreed that the City was right right when it granted The Donald a building permit for what he calls the “tallest residential building in the world.”

“It’s been a battle,” Trump told The Post, happy to learn that neighbors – including Seymour Flug, Walter Cronkite and Alberto Vialar – had been foiled again in their quest to topple his building.

“It’s a group of wealthy people that lost their views.”

But now, the neighbors say, they’ll appeal. “We plan to file,” said Flug, the former Diner’s Club chairman who lives in the 50-story 100 U.N. Plaza across 48th Street. He now heads a vitamin company.

The neighbors argue that the Trump site, at 845 First Ave. on the western end of the block, is subject to zoning regulations that require a shorter, fatter building.

“What they have is a tower in a plaza; what they don’t have is a tower on a base,” said one of Flug’s attorneys.

The tower, designed by Costas Kondylis, is a slender 80 by 145 foot slab, and is set back in what will become a landscaped plaza from its First Avenue, 47th and 48th Street sides and the neighboring Japan Society.

The building was topped off in a ceremony on July 28, and when it is completed this year and the current dark protective coverings are peeled off, the windows will have a bronze cast. One of the new tenants is to be Bill Gates.

“It’s a great victory,” asserted Trump, who has a solution for the neighbors whose views are blocked. “They should move into my building.”

But would he give them a discount? “Never.”

Trump said space in his new building, which is expected to open in January, is already 70 percent sold, and that he hopes to add more super-skyscrapers to the city skyline.

“I’m the greatest developer in New York, and I plan to keep going,” he said. In February, 1999, the neighbors, under the Beekman Hill Association banner, asked the Buildings Department to revoke the Tower’s permit, issued in October 1998. When rejected, they appealed in April 1999 to the Bureau of Standards and Appeals (BSA), which, in September 1999, also agreed with the city’s issuance of the permit.

“We always knew that going to the Buildings Department and the BSA would never work, being that both are controlled by the mayor,” said Flug.

Should the neighbors win on appeal, they hope floors will have to come off, as was the case in a decade-old decision in which an out-of-date zoning map had been used and about nine floors of a residential building were lopped off prior to occupancy.